4TO

 I. (noun) 

Sense 1

Meaning:

The size of a book whose pages are made by folding a sheet of paper twice to form four leaves

Synonyms:

4to; quarto

Classified under:

Nouns denoting attributes of people and objects

Hypernyms ("4to" is a kind of...):

size (the property resulting from being one of a series of graduated measurements (as of clothing))

Credits